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Subject[PATCH V3] PM / EM: Micro optimization in em_cpu_energy
When the sum of the utilization of CPUs in a performance domain is
zero, return the energy as 0 without doing any computations.

Signed-off-by: Pavankumar Kondeti <>
V3: %s/power/performance as corrected by Quentin
V2: Fixed the function name in the commit message.

include/linux/energy_model.h | 3 +++
1 file changed, 3 insertions(+)

diff --git a/include/linux/energy_model.h b/include/linux/energy_model.h
index b67a51c..8810f1f 100644
--- a/include/linux/energy_model.h
+++ b/include/linux/energy_model.h
@@ -103,6 +103,9 @@ static inline unsigned long em_cpu_energy(struct em_perf_domain *pd,
struct em_perf_state *ps;
int i, cpu;

+ if (!sum_util)
+ return 0;
* In order to predict the performance state, map the utilization of
* the most utilized CPU of the performance domain to a requested
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
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